Fucus ilicifolius Turner An annotated list of brown seaweeds (Phaeophyceae) from Nakadori Island (northern Goto Islands, Nagasaki, Japan) Belleza, Dominic Franco C. Tateishi, Hiroto Tanimae, Shin-Ichiro Kobayashi, Taishun Aota, Tomoyuki Urasawa, Toshiki Nishihara, Gregory N. Phytotaxa 2025 2025-03-18 694 1 1 24 (Turner) C. Agardh, 1820 C. Agardh 1820 Turner [157,704,1814,1841] Phaeophyceae Sargassaceae Sargassum Chromista Fucales 13 14 Ochrophyta species ilicifolium  Basionym:  Fucus ilicifoliusTurner    Typelocality:—Sunda Strait, Indonesia   Description and remarks:—The specimen is small with a height of 6 cm. Leaves may be 1.5 cmlong and 1 cmin width, with dentate margins. The leaves may sometimes bear duplicated leaf margins ( Liao et al., 2013) where the leaf folds along one third of one side of the leaf or along the axis of the faint midrib. This results in one side being smooth or bending slightly inward creating a crescent margin, similar to  Sargassum hemiphyllumleaves. This species was observed growing in small patches along the shallow windward side of Yokoura in mid spring until mid summer, together with other species of  Sargassum, namely  S. muticumand  S. micracanthum.   Materials examined:—18ECS1-130 (1 to 2)